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ilnrrnn TATES ATENT rrrcn.

ERNST KONIG, OF I IGCI-IST-ON-THE-MAIN, GERMA NY, ASSIGNOR TO THE FARE- IVERKE, VORMALS MEISTER, LUCIUS 82; BRUNING, OF SAME PLACE.

BASIC RED DISAZO DYE.

SPECIFICATION forming part of Letters Patent No. 602,637, dated April 19, 1898.

\ Application filed May 6, 1897. Serial No. 635,396. (Specimens) To all whom, it may concern.-

Be it known that I, ERNST KoNIG, doctor of philosophy, a citizen of the Empire of Germany, residing at Hochst-on-the-W'Iain, Germany, have invented certain new and useful Improvements in the Manufacture of a Scarlet-Red Dyestuff, of which the following is a specification. V V

This invention relates to a basic scarlet-red disazo dyestuff which is obtained by the action of diazotized meta-trimethyl ammonium phenyl azo meta -toluidin upon beta naphthol.

The reaction is set out in the following equation:

50 in the foregoing equation means ohlorin or an equivalent radical of an acid.

I proceed,forinstance,as follows: 47 .7 kiols of the zinc chlorid double salt of meta-trimethyl ammonium phenyl-azo-meta-toluidin hydrochlorid are dissolved in about one thou sand liters of water and diazotized at to centigrade by the addition of twenty kilos of hydrochloric acid of Baum and 6. 9 kilos of sodium nitrite. .The solution thus obtained is run into a solution of 14.42 kilos of. betanaphthol and four kilos of caustic soda under gradual addition of fifteen kilos of acetate of sodium. When the reaction is completed,

the whole is brought into solution by heating, 5 5 and the dyestuff is separated with common salt from the filtered solution.

The dyestuff thus obtained has the following properties: It forms a brown-red powder soluble in water with a blue-red color. changes it to yellowish red and soda-lye to violet. Hydrochloric acid produces a redyellow solution. It dissolves in concentrated sulfuric acid with a green color. It is soluble in alcohol and insoluble in ether, benzene, or petroleum ether.

The new dyestuff dyes tanned and untanned cotton scarlet red, as well as half-wool, evenly in an acid-bath.

Having thus described my invention, I claim as new and desire to secure by Letters Patent As anew product, the scarlet-red dyestuff, obtained from diazotized meta-trimethyl ammonium phenyl-azo-meta-toluidin and betanaphthol, being a brown-red powder, soluble in water with a blue-red color, soluble in alcohol, insoluble in benzene, ether or petroleum ether, and dyeing tanned and untanned cotton as well as half-wool scarlet red in an acidbath, substantially as set forth.

In testimony that I claim the foregoing as my invention I have signed my name in presence of two subscribing witnesses.

ERNST KONIG.

Witnesses HEINRICH HAHN, ALFRED BRISBIN.

Soda 4o 4 

